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Letcher, John S. (author), Cressy, C.P. (author), Oliver, J.C. (author), Fritts, M.J. (author)
journal article 1987
document
Letcher, John S. (author), Cressy, C.P. (author), Oliver, J.C. (author), Fritts, M.J. (author)
conference paper 1987